package com.AICoupon.service.impl;


import cn.hutool.core.bean.BeanUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.AICoupon.dto.Result;
import com.AICoupon.dto.UserDTO;
import com.AICoupon.entity.Follow;
import com.AICoupon.mapper.FollowMapper;
import com.AICoupon.service.IFollowService;
import com.AICoupon.service.IUserService;
import com.AICoupon.utils.UserHolder;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

@Service
public class IFollowServiceImpl extends ServiceImpl<FollowMapper, Follow> implements IFollowService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Resource
    private IUserService userService;
    @Override
    public Result follow(Long followUserId, Boolean isFollow) {

        //1.获取用户id
        Long userId = UserHolder.getUser().getId();
        String key = "follow:" + userId;
        //2.查询当前用户是否关注该用户
        if (isFollow) {
            //2.1.关注
            Follow follow = new Follow();
            follow.setUserId(userId);
            follow.setFollowUserId(followUserId);
            save(follow);
            stringRedisTemplate.opsForSet().add(key, followUserId.toString());
        } else {
            //2.2.取消关注
            boolean isSuccess = remove(new QueryWrapper<Follow>().eq("user_id", userId).eq("follow_user_id", followUserId));
            if (isSuccess) {
                stringRedisTemplate.opsForSet().remove(key, followUserId.toString());
            }
        }
        return Result.ok();
    }

    @Override
    public Result isFollow(Long followUserId) {
        Long userId = UserHolder.getUser().getId();
        Integer count = query().eq("user_id", userId).eq("follow_user_id", followUserId).count();
        return Result.ok(count > 0);
    }

    @Override
    public Result followCommons(Long id) {
        Long userId = UserHolder.getUser().getId();
        Set<String> intersect = stringRedisTemplate.opsForSet().intersect("follow:" + id, "follow:" + userId);
        if (intersect == null || intersect.isEmpty()) {
            return Result.ok();
        }
        //解析id集合
        List<Long> collect = intersect.stream().map(Long::valueOf).collect(Collectors.toList());
        List<UserDTO> users = userService.listByIds(collect)
                .stream()
                .map(user -> BeanUtil.copyProperties(user, UserDTO.class))
                .collect(Collectors.toList());

        return Result.ok(users);
    }
}
